SH7750_08 Datasheet, PDF (313/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 7 Instruction Set
executed in 4xIck. The maximum number of instructions that can be executed in 2xIck or
4xIck is four or eight, respectively. Therefore, the affected codes are those occurring in
“the four words (or eight words) of data following the instruction.”
Workarounds: To prevent the problem, use either of workarounds a. or b. below.
a. Include a NOP instruction in the eight words of data following each TRAPA instruction,
SLEEP instruction, or undefined instruction code H'FFFD.
b. Include an OR R0,R0 instruction in the five words of data following each TRAPA instruction,
SLEEP instruction, or undefined instruction code H'FFFD. This workaround also applies to
cases where “the eight words of data following the … instruction … contain H'Fxxx,” as
mentioned in condition 4. b., because two OR instructions are never executed simultaneously,
so a minimum of 5xIck is required for execution.
Rev.7.00 Oct. 10, 2008 Page 229 of 1074
REJ09B0366-0700